Delay to browse between Tab Bar items

I've three screens in my app: "Pedidos", "Dados" and "Conta".

In "Pedidos" ViewController I've a UITableView with very data, my problem is that when I browse from Pedidos's ViewController to another item ViewController the app stop run for a little moment, this not happens with other ViewController. To show my problem I make a GIF:

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I don't know why this happens, but this delay is very bad to my app.